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authorDan Goodliffe <dan@randomdan.homeip.net>2023-02-01 00:16:04 +0000
committerDan Goodliffe <dan@randomdan.homeip.net>2023-02-01 00:16:07 +0000
commit762546c827046358b06cffbd82eb91d723b63047 (patch)
treea68180e4000b886edf3cbb154d9f8b01b478b87e /lib
parentAdd missing braces (diff)
downloadilt-762546c827046358b06cffbd82eb91d723b63047.tar.bz2
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Add utilities for mutating, concatenating, creating vectors
Diffstat (limited to 'lib')
-rw-r--r--lib/collections.hpp43
1 files changed, 43 insertions, 0 deletions
diff --git a/lib/collections.hpp b/lib/collections.hpp
index 5d39e79..47967b2 100644
--- a/lib/collections.hpp
+++ b/lib/collections.hpp
@@ -1,7 +1,10 @@
#pragma once
+#include <algorithm>
#include <array>
#include <span>
+#include <utility>
+#include <vector>
template<typename T, typename E>
concept SequentialCollection = requires(T c) {
@@ -59,3 +62,43 @@ operator*=(std::span<T> & in, auto && f)
}
return in;
}
+
+template<template<typename...> typename C, typename... T>
+constexpr auto
+operator*(const C<T...> & in, auto && f)
+{
+ C<decltype(f(in[0]))> out;
+
+ std::transform(in.begin(), in.end(), std::inserter(out, out.end()), f);
+ return out;
+}
+
+template<typename... T>
+constexpr auto &
+operator+=(std::vector<T...> & in, std::vector<T...> && src)
+{
+ in.reserve(in.size() + src.size());
+ std::move(src.begin(), src.end(), std::back_inserter(in));
+ return in;
+}
+
+template<typename... T>
+constexpr auto
+operator+(std::vector<T...> && in, std::vector<T...> && src)
+{
+ in.reserve(in.size() + src.size());
+ std::move(src.begin(), src.end(), std::back_inserter(in));
+ return in;
+}
+
+template<template<typename> typename Direction = std::plus>
+static auto
+vectorOfN(std::integral auto N, unsigned int start = {}, unsigned int step = 1)
+{
+ std::vector<unsigned int> v;
+ v.resize(N);
+ std::generate_n(v.begin(), N, [&start, step, adj = Direction {}]() {
+ return std::exchange(start, adj(start, step));
+ });
+ return v;
+}